THE monthly gathering of bicyclists making our presence known downtown. Unplanned route gently winds a dozen miles or more. Thousands attend in good weather. Includes music, hipsters, athletes, show bikes, so much more. Skaters welcome.chi.bikeDaley Plaza, 773/486-4861, 50 W Washington. Under the Picasso (giant rusty bird), at Dearborn, SW of State&Lake train stop.chicagocriticalmass.orgMAPPHOTOSEVENTSINFOSHARE